drop database if exists liuyan;
create database liuyan;
use liuyan;
create table user_inf
(
id int auto_increment primary key,
name varchar(255),
pass varchar(255)
);
insert into user_inf
values(null,'crazyit','123');
insert into user_inf
values(null,'tiger','123');
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author yeeku.H.lee kongyeeku@163.com
version 1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date:
--%>
<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCtype html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> 收集参数的表单页 </title>
<meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<form id="form1" method="post" action="aa">
用户名：<br/>
<input type="text" name="name"><hr/>
性别：<br/>
男：<input type="radio" name="gender" value="男">
女：<input type="radio" name="gender" value="女"><hr/>
喜欢的颜色：<br/>
红：<input type="checkbox" name="color" value="红">
绿：<input type="checkbox" name="color" value="绿">
蓝：<input type="checkbox" name="color" value="蓝"><hr/>
来自的国家：<br/>
<select name="country">
<option value="中国">中国</option>
<option value="美国">美国</option>
<option value="俄罗斯">俄罗斯</option>
</select><hr/>
<input type="submit" value="提交">
<input type="reset" value="重置">
</form>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author yeeku.H.lee kongyeeku@163.com
version 1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date:
--%>
<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> 用户登录 </title>
<meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<!-- 输出出错提示 -->
<span style="color:red;font-weight:bold">
<%
if (request.getAttribute("err") != null)
{
out.println(request.getAttribute("err") + "<br/>");
}
%>
</span>
请输入用户名和密码：
<!-- 登录表单，该表单提交到一个Servlet -->
<form id="login" method="post" action="login">
用户名：<input type="text" name="username"/><br/>
密  码：<input type="password" name="pass"/><br/>
<input type="submit" value="登录"/><br/>
</form>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author yeeku.H.lee kongyeeku@163.com
version 1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date:
--%>
<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> 欢迎页面 </title>
<meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<h3>欢迎登录</h3>
<%=session.getAttribute("name")%>,欢迎登录！
</body>
</html>
<?xml version="1.0" encoding="GBK"?>
<!-- 定义生成文件的project根元素，默认的target为空 -->
<project name="web" basedir="." default="">
<!-- 定义三个简单属性 -->
<property name="src" value="src"/>
<property name="classes" value="classes"/>
<!-- 定义一组文件和目录集 -->
<path id="classpath">
<fileset dir="lib">
<include name="*.jar"/>
</fileset>
<pathelement path="${classes}"/>
</path>
<!-- 定义compile target，用于编译Java源文件 -->
<target name="compile" description="编译Java源文件">
<!-- 先删除classes属性所代表的文件夹 -->
<delete dir="${classes}"/>
<!-- 创建classes属性所代表的文件夹 -->
<mkdir dir="${classes}"/>
<!-- 编译Java文件，编译后的class文件放到classes属性所代表的文件夹内 -->
<javac destdir="${classes}" debug="true" includeantruntime="yes"
deprecation="false" optimize="false" failonerror="true">
<!-- 指定需要编译的Java文件所在的位置 -->
<src path="${src}"/>
<!-- 指定编译Java文件所需要第三方类库所在的位置 -->
<classpath refid="classpath"/>
</javac>
</target>
</project>
<?xml version="1.0" encoding="GBK"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<!-- 配置Servlet的名字 -->
<servlet>
<!-- 指定Servlet的名字，
相当于指定@WebServlet的name属性 -->
<servlet-name>firstServlet</servlet-name>
<!-- 指定Servlet的实现类 -->
<servlet-class>lee.FirstServlet</servlet-class>
</servlet>
<!-- 配置Servlet的URL -->
<servlet-mapping>
<!-- 指定Servlet的名字 -->
<servlet-name>firstServlet</servlet-name>
<!-- 指定Servlet映射的URL地址，
相当于指定@WebServlet的urlPatterns属性-->
<url-pattern>/aa</url-pattern>
</servlet-mapping>
<servlet>
<!-- Servlet名 -->
<servlet-name>timerServlet</servlet-name>
<!-- Servlet的实现类 -->
<servlet-class>lee.TimerServlet</servlet-class>
<!-- 配置应用启动时，创建Servlet实例
，相当于指定@WebServlet的loadOnStartup属性-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet>
<!-- 配置Servlet名 -->
<servlet-name>testServlet</servlet-name>
<!-- 指定Servlet的实现类 -->
<servlet-class>lee.TestServlet</servlet-class>
<!-- 配置Servlet的初始化参数：driver -->
<init-param>
<param-name>driver</param-name>
<param-value>com.mysql.jdbc.Driver</param-value>
</init-param>
<!-- 配置Servlet的初始化参数：url -->
<init-param>
<param-name>url</param-name>
<param-value>jdbc:mysql://localhost:3306/javaee</param-value>
</init-param>
<!-- 配置Servlet的初始化参数：user -->
<init-param>
<param-name>user</param-name>
<param-value>root</param-value>
</init-param>
<!-- 配置Servlet的初始化参数：pass -->
<init-param>
<param-name>pass</param-name>
<param-value>32147</param-value>
</init-param>
</servlet>
<servlet-mapping>
<!-- 确定Servlet名 -->
<servlet-name>testServlet</servlet-name>
<!-- 配置Servlet映射的URL -->
<url-pattern>/testServlet</url-pattern>
</servlet-mapping>
</web-app>
package lee;
import java.sql.*;
/**
* Description:
* <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
* <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author Yeeku.H.Lee kongyeeku@163.com
* @version 1.0
*/
public class DbDao
{
private Connection conn;
private String driver;
private String url;
private String username;
private String pass;
public DbDao()
{
}
public DbDao(String driver , String url
, String username , String pass)
{
this.driver = driver;
this.url = url;
this.username = username;
this.pass = pass;
}
// 下面是各个成员属性的setter和getter方法
public void setDriver(String driver) {
this.driver = driver;
}
public void setUrl(String url) {
this.url = url;
}
public void setUsername(String username) {
this.username = username;
}
public void setPass(String pass) {
this.pass = pass;
}
public String getDriver() {
return (this.driver);
}
public String getUrl() {
return (this.url);
}
public String getUsername() {
return (this.username);
}
public String getPass() {
return (this.pass);
}
// 获取数据库连接
public Connection getConnection() throws Exception
{
if (conn == null)
{
Class.forName(this.driver);
conn = DriverManager.getConnection(url,username,
this. pass);
}
return conn;
}
// 插入记录
public boolean insert(String sql , Object... args)
throws Exception
{
PreparedStatement pstmt = getConnection().prepareStatement(sql);
for (int i = 0; i < args.length ; i++ )
{
pstmt.setObject( i + 1 , args[i]);
}
if (pstmt.executeUpdate() != 1)
{
return false;
}
pstmt.close();
return true;
}
// 执行查询
public ResultSet query(String sql , Object... args)
throws Exception
{
PreparedStatement pstmt = getConnection().prepareStatement(sql);
for (int i = 0; i < args.length ; i++ )
{
pstmt.setObject( i + 1 , args[i]);
}
return pstmt.executeQuery();
}
// 执行修改
public void modify(String sql , Object... args)
throws Exception
{
PreparedStatement pstmt = getConnection().prepareStatement(sql);
for (int i = 0; i < args.length ; i++ )
{
pstmt.setObject( i + 1 , args[i]);
}
pstmt.executeUpdate();
pstmt.close();
}
// 关闭数据库连接的方法
public void closeConn()
throws Exception
{
if (conn != null && !conn.isClosed())
{
conn.close();
}
}
}
package lee;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.*;
/**
* Description:
* <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
* <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author Yeeku.H.Lee kongyeeku@163.com
* @version 1.0
*/
// Servlet必须继承HttpServlet类
@WebServlet(name="firstServlet"
, urlPatterns={"/firstServlet"})
public class FirstServlet extends HttpServlet
{
// 客户端的响应方法，使用该方法可以响应客户端所有类型的请求
public void service(HttpServletRequest request,
HttpServletResponse response)
throws ServletException,java.io.IOException
{
// 设置解码方式
request.setCharacterEncoding("GBK");
response.setContentType("text/html;charSet=GBK");
// 获取name的请求参数值
String name = request.getParameter("name");
// 获取gender的请求参数值
String gender = request.getParameter("gender");
// 获取color的请求参数值
String[] color = request.getParameterValues("color");
// 获取country的请求参数值
String national = request.getParameter("country");
// 获取页面输出流
PrintStream out = new PrintStream(response.getOutputStream());
//输出HTML页面标签
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet测试</title>");
out.println("</head>");
out.println("<body>");
// 输出请求参数的值：name
out.println("您的名字：" + name + "<hr/>");
// 输出请求参数的值：gender
out.println("您的性别：" + gender + "<hr/>");
// 输出请求参数的值：color
out.println("您喜欢的颜色：");
for(String c : color)
{
out.println(c + " ");
}
out.println("<hr/>");
out.println("您喜欢的颜色：");
// 输出请求参数的值：national
out.println("您来自的国家：" + national + "<hr/>");
out.println("</body>");
out.println("</html>");
}
}
package lee;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.PrintWriter;
import java.io.IOException;
import java.sql.*;
/**
* Description:
* <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
* <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author Yeeku.H.Lee kongyeeku@163.com
* @version 1.0
*/
@WebServlet(name="login"
, urlPatterns={"/login"})
public class LoginServlet extends HttpServlet
{
// 响应客户端请求的方法
public void service(HttpServletRequest request,
HttpServletResponse response)
throws ServletException,java.io.IOException
{
String errMsg = "";
// Servlet本身并不输出响应到客户端，因此必须将请求转发到视图页面
RequestDispatcher rd;
// 获取请求参数
String username = request.getParameter("username");
String pass = request.getParameter("pass");
try
{
// Servlet本身并不执行任何的业务逻辑处理，它调用JavaBean处理用户请求
DbDao dd = new DbDao("com.mysql.jdbc.Driver",
"jdbc:mysql://localhost:3306/liuyan","root","32147");
// 查询结果集
ResultSet rs = dd.query("select pass from user_inf"
+ " where name = ?", username);
if (rs.next())
{
// 用户名和密码匹配
if (rs.getString("pass").equals(pass))
{
// 获取session对象
HttpSession session = request.getSession(true);
// 设置session属性，跟踪用户会话状态
session.setAttribute("name" , username);
// 获取转发对象
rd = request.getRequestDispatcher("/welcome.jsp");
// 转发请求
rd.forward(request,response);
}
else
{
// 用户名和密码不匹配时
errMsg += "您的用户名密码不符合,请重新输入";
}
}
else
{
// 用户名不存在时
errMsg += "您的用户名不存在,请先注册";
}
}
catch (Exception e)
{
e.printStackTrace();
}
// 如果出错，转发到重新登录
if (errMsg != null && !errMsg.equals(""))
{
rd = request.getRequestDispatcher("/login.jsp");
request.setAttribute("err" , errMsg);
rd.forward(request,response);
}
}
}
package lee;
import java.sql.*;
import javax.servlet.http.*;
import javax.servlet.*;
import javax.servlet.annotation.*;
import java.io.*;
/**
* Description:
* <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
* <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author Yeeku.H.Lee kongyeeku@163.com
* @version 1.0
*/
@WebServlet(name="testServlet"
, urlPatterns={"/testServlet"}
, initParams={
@WebInitParam(name="driver", value="com.mysql.jdbc.Driver"),
@WebInitParam(name="url", value="jdbc:mysql://localhost:3306/javaee"),
@WebInitParam(name="user", value="root"),
@WebInitParam(name="pass", value="32147")})
public class TestServlet extends HttpServlet
{
// 重写init方法
public void init(ServletConfig config)
throws ServletException
{
// 重写该方法，应该首先调用父类的init()方法
super.init(config);
}
// 响应客户端请求的方法
public void service(HttpServletRequest request,
HttpServletResponse response)
throws ServletException,java.io.IOException
{
try
{
// 获取ServletConfig对象
ServletConfig config = getServletConfig();
// 通过ServletConfig对象获取配置参数：dirver
String driver = config.getInitParameter("driver");
// 通过ServletConfig对象获取配置参数：url
String url = config.getInitParameter("url");
// 通过ServletConfig对象获取配置参数：user
String user = config.getInitParameter("user");
// 通过ServletConfig对象获取配置参数：pass
String pass = config.getInitParameter("pass");
// 注册驱动
Class.forName(driver);
// 获取数据库连接
Connection conn = DriverManager.getConnection(url,user,pass);
// 创建Statement对象
Statement stmt = conn.createStatement();
// 执行查询，获取ResuletSet对象
ResultSet rs = stmt.executeQuery("select * from news_inf");
response.setContentType("text/html;charSet=gbk");
// 获取页面输出流
PrintStream out = new PrintStream(response.getOutputStream());
// 输出HTML标签
out.println("<html>");
out.println("<head>");
out.println("<title>访问Servlet初始化参数测试</title>");
out.println("</head>");
out.println("<body>");
out.println("<table bgcolor=\"#9999dd\" border=\"1\"" +
"width=\"480\">");
// 遍历结果集
while(rs.next())
{
// 输出结果集内容
out.println("<tr>");
out.println("<td>" + rs.getString(1) + "</td>");
out.println("<td>" + rs.getString(2) + "</td>");
out.println("</tr>");
}
out.println("</table>");
out.println("</body>");
out.println("</html>");
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
package lee;
import javax.servlet.http.*;
import javax.servlet.*;
import javax.servlet.annotation.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.Date;
/**
* Description:
* <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
* <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author Yeeku.H.Lee kongyeeku@163.com
* @version 1.0
*/
@WebServlet(loadOnStartup=1)
public class TimerServlet extends HttpServlet
{
public void init(ServletConfig config)throws ServletException
{
super.init(config);
Timer t = new Timer(1000,new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
System.out.println(new Date());
}
});
t.start();
}
}
